Sergey Z@zsergeyRussiaFollow BadgesProblem SolvingCPPRuby CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Ruby (Basic)VerifiedskillCertificate: Ruby (Intermediate)VerifiedskillCertificate: C++ (Basic)VerifiedskillWork Experiencezsergey has not updated employment details yet.Educationzsergey has not updated education details yet.